I have to come out on the side of Apple on this one, but this is also a big case of serious over-reaction. While I did find the idea rather interesting, as a former employee of CompUSA in my youth, I was endlessly frustrated by pranksters (prankster, artist -- that depends on who's shoes you occupy at the time).

Every single day we had someone come in and try the old "echo y|format c:", create various silly GWBASIC:

     10 PRINT "Something Really Profane"
     20 GOTO 10

or at worst, insert virus infected floppy disks (yes, that was how long ago I worked there), or otherwise make the demo machines, both Mac and PC, non-functional.

We had a guy create a DOS TSR app that made the internal speakers spit out beeps at random intervals, random lengths and random pitches, all precisely timed. We thought it had to be an employee, since someone would have otherwise noticed a customer methodically visiting each machine.

I knew it was an employee, because I was the one who did it. No member of the Secret Service came knocking on my door. Thanks to the lack of video cameras at the time, I didn't even get reprimanded (my direct boss knew I did it, but thought it was art, or at least, rather funny, and it was done on a Wednesday in the summer, so it was minimally disruptive ... it also didn't involve taking pictures of folks without their knowledge ... legal or otherwise, that just has an ick factor to it).

EDIT: Didn't like that last sentence, needed more dots.